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Preparation of garnet type solid electrolyte and secondary battery using garnet type solid electrolyte

A solid-state electrolyte, garnet-type technology, applied in the field of lithium ion batteries, can solve the problems of low load of electrode active material, volume change of electrode material, poor cycle stability, etc., and achieve wide electrochemical window, high safety and high stability. Effect

Inactive Publication Date: 2019-05-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the development of solid-state batteries with superior performance still faces many scientific and technical challenges: for example, the volume change of electrode materials, large interface (electrode / electrolyte) resistance, low loading of electrode active materials, poor cycle stability, and low safety performance, etc.

Method used

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  • Preparation of garnet type solid electrolyte and secondary battery using garnet type solid electrolyte
  • Preparation of garnet type solid electrolyte and secondary battery using garnet type solid electrolyte
  • Preparation of garnet type solid electrolyte and secondary battery using garnet type solid electrolyte

Examples

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Effect test

Embodiment example 1

[0043]According to the characteristics of the sol-gel method, anhydrous lithium nitrate, lanthanum nitrate hexahydrate, and zirconium acetylacetonate are preferably used as metal sources for preparing LLZO. According to Li 7 La 3 Zr 2 o 12 Weigh anhydrous lithium nitrate (excess 10% to 20%), lanthanum nitrate hexahydrate, zirconium acetylacetonate, add a small amount of aluminum nitrate, dissolve in water to prepare a solution and stir evenly with a magnetic stirrer. The complexing agent citric acid was dissolved in water and magnetically stirred evenly, and several drops of 65% nitric acid were added to the citric acid solution. Add the complexing agent dropwise to the mixed liquid, heat and evaporate the solvent after the reaction is complete, the evaporation temperature is generally slightly lower than the boiling point of the solvent, so the evaporation temperature is preferably 80°C. As the solvent evaporated, a dark gel was obtained. The resulting gel was dried for ...

Embodiment example 2

[0045] The buffer layer material preparation is similar to the LLZO preparation process. When the metal salt is completely dissolved, a certain amount of lithium iron phosphate powder is added to obtain a uniformly dispersed turbid liquid. The complexing agent citric acid is dissolved in water and magnetically stirred evenly, and several drops of 65% nitric acid are added to the citric acid solution. Add complexing agent dropwise to the mixed liquid to carry out complexation reaction. After the reaction is complete, heat and evaporate the solvent to dryness. The evaporation temperature is generally slightly lower than the boiling point of the solvent, so the evaporation temperature is preferably 80°C. As the solvent evaporated, a black gel was obtained. The resulting gel was dried for 48 hours in a blast drying oven to obtain a xerogel. The drying temperature at this stage is higher than the boiling point of water, preferably 100°C. After the dry gel was ground evenly, it ...

Embodiment example 3

[0047] The conductivity test of inorganic solid electrolytes is generally carried out in the form of ceramic sheets, and metals, such as Au, are sputtered or evaporated on both ends of the ceramic sheets. This is used as a blocking electrode for testing, since Au + It has a certain blocking effect, so it presents an obvious capacitive reactance arc in the low frequency region of the impedance spectrum. The prepared ceramic sheet was polished, and after the surface of the LLZO ceramic sheet was plated with gold, the AC impedance test was carried out on the LLZO ceramic sheet. Using EIS AC impedance spectroscopy for testing. The frequency range is 0.1Hz ~ 1MHz, and the test temperature is room temperature. Spectrum such as image 3 It is shown that the as-prepared material has low electrical resistance and high ionic conductivity.

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Abstract

The invention relates to preparation of a garnet type solid electrolyte material, and a buffer layer design and the solid electrolyte of the type are applied to a solid-state lithium ion secondary battery. The preparation in the invention can be applied to all-solid-state lithium ion batteries, lithium-sulfur batteries and the like and has the functions of electrolyte and diaphragms. The solid electrolyte of the type has the characteristics of high ionic conductivity, stability, chemical stability, wide electrochemical window and the like, the preparation process of the lithium ion battery canbe simplified, the cost can be reduced, and the safety of the battery can be remarkably improved.

Description

technical field [0001] The invention relates to the preparation of a garnet-type lithium lanthanum zirconium oxide lithium ion conductor, the preparation of a solid electrolyte composite material, and a lithium ion battery using the solid electrolyte and the composite material. Background technique [0002] Lithium-ion batteries are one of the key components of the portable, entertainment, computing and telecommunications devices demanded in today's society. At the same time, with the development of electronic products, electric vehicles, and new energy industries, higher requirements are put forward for the energy density, long cycle performance, and safety of lithium-ion batteries. Lithium secondary batteries based on liquid electrolytes cannot carry higher energy density due to electrochemical stability, thermal stability, safety and other reasons and have potential safety hazards. Solid-state lithium-ion batteries using solid-state electrolytes can effectively overcome ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 韩百川王森浩卢侠曹达鹏
Owner BEIJING UNIV OF CHEM TECH
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